A novel M-ary MC-CDMA system in uplink TDD mode is proposed based on orthogonal cyclic codes and pre-equalization.

Recent technology advance on transmitter-side DSP such as digital pulse-shaping, pre-equalization and digital nonlinear compensation has also been discussed.

Propose an overlap structure equalization algorithm for the pre-echo channel, which can weaken the dependence on feedforward equalizer, enhance the performance and reduce the complexity.